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Finding the Fourth Proportional to 70,915.68, 97,864.32 and 39,085.80

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Solution

The fourth proportional to 70,915.68, 97,864.32 and 39,085.80 is: 53,938.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,915.68 : 97,864.32 = 39,085.80 : x
  2. Step 2: Convert to fraction form
    70,915.68/97,864.32 = 39,085.80/x
  3. Step 3: Cross multiply
    70,915.68x = 97,864.32 × 39,085.80
  4. Step 4: Simplify right side
    70,915.68x = 3,825,105,238.66
  5. Step 5: Solve for x
    x = 3,825,105,238.66/70,915.68
  6. Step 6: Final answer
    x = 53,938.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.